Index: build.sh
--- build.sh.orig	2019-06-07 20:27:48.285838000 +0200
+++ build.sh	2019-06-07 20:29:19.044630000 +0200
@@ -39,7 +39,7 @@
 done
 
 CC="${CC:-gcc}"
-COMP_FLAGS="${CPPFLAGS:-} ${CFLAGS:-} -w -O3 -fno-strict-aliasing$extraBuildArgs"
+COMP_FLAGS="${CPPFLAGS:-} ${CFLAGS:-} -fno-strict-aliasing$extraBuildArgs"
 LINK_FLAGS="${LDFLAGS:-} "
 PS4=""
 # platform detection
@@ -84,7 +84,6 @@
     ;;
   *freebsd* )
     myos="freebsd"
-    CC="clang"
     LINK_FLAGS="$LINK_FLAGS -lm"
     ;;
   *openbsd* )
@@ -97,7 +96,6 @@
     ;;
   *darwin* )
     myos="macosx"
-    CC="clang"
     LINK_FLAGS="$LINK_FLAGS -ldl -lm"
     if [ "$HOSTTYPE" = "x86_64" ] ; then
       ucpu="amd64"
Index: install.sh
--- install.sh.orig	2019-06-06 21:32:56.000000000 +0200
+++ install.sh	2019-06-07 20:27:48.286685000 +0200
@@ -61,6 +61,9 @@
       mkdir -p $1/nim
       mkdir -p $bindir
       mkdir -p $configdir
+      mkdir -p $libdir
+      mkdir -p $docdir
+      mkdir -p $datadir
       ;;
   esac